dc.contributor.author | Pinakoulaki, Eftychia | en |
dc.contributor.author | Ohta, T. | en |
dc.contributor.author | Soulimane, T. | en |
dc.contributor.author | Kitagawa, T. | en |
dc.contributor.author | Varotsis, Constantinos | en |
dc.creator | Pinakoulaki, Eftychia | en |
dc.creator | Ohta, T. | en |
dc.creator | Soulimane, T. | en |
dc.creator | Kitagawa, T. | en |
dc.creator | Varotsis, Constantinos | en |
dc.date.accessioned | 2019-11-21T06:22:20Z | |
dc.date.available | 2019-11-21T06:22:20Z | |
dc.date.issued | 2005 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/56029 | |
dc.description.abstract | Reaction pathways in the enzymatic formation and cleavage of the N-N and N-O bonds, respectively, are difficult to verify without the structure of the intermediates, but we now have such information on the heme a3 2+-NO species formed in the reaction of ba3-oxidase with NO from resonance Raman spectroscopy. We have identified the His-heme a 3 2+-NO/CuB 1+ species by its characteristic Fe-NO and N-O stretching frequencies at 539 and 1620 cm -1, respectively. The Fe-NO and N-O frequencies in ba 3-oxidase are 21 and 7 cm-1 lower and higher, respectively, than those observed in Mb-NO. From these results and earlier Raman and FTIR measurements, we demonstrate that the protein environment of the proximal His384 that is part of the Q-proton pathway controls the strength of the Fe-His384 bond upon ligand (CO vs NO) binding. We also show by time-resolved FTIR spectroscopy that CuB 1+ has a much lower affinity for NO than for CO. We suggest that the reduction of NO to NaO by ba 3-oxidase proceeds by the fast binding of the first NO molecule to heme a3 with high-affinity, and the second NO molecule binds to CuB with low-affinity, producing the temporal co-presence of two NO molecules in the heme-copper center. The low-affinity of CUB for NO binding also explains the NO reductase activity of the ba3-oxidase as opposed to other heme-copper oxidases. With the identification of the His-heme a 3 2+-NO/CuB 1+ species, the structure of the binuclear heme a3-CuB 1+ center in the initial step of the NO reduction mechanism is known. © 2005 American Chemical Society. | en |
dc.source | Journal of the American Chemical Society | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-27544440507&doi=10.1021%2fja0539490&partnerID=40&md5=6e8d7a6377ae540f1fa50dec9fb26dd4 | |
dc.subject | article | en |
dc.subject | nonhuman | en |
dc.subject | drug derivative | en |
dc.subject | metabolism | en |
dc.subject | binding affinity | en |
dc.subject | enzyme activity | en |
dc.subject | chemistry | en |
dc.subject | enzymology | en |
dc.subject | Reaction kinetics | en |
dc.subject | Raman spectroscopy | en |
dc.subject | oxidation reduction reaction | en |
dc.subject | Oxidation-Reduction | en |
dc.subject | chemical bond | en |
dc.subject | Reduction | en |
dc.subject | copper | en |
dc.subject | Fourier transform infrared spectroscopy | en |
dc.subject | reaction analysis | en |
dc.subject | Ligands | en |
dc.subject | infrared spectroscopy | en |
dc.subject | ligand | en |
dc.subject | Enzymes | en |
dc.subject | protein structure | en |
dc.subject | binding site | en |
dc.subject | proton | en |
dc.subject | Binding Sites | en |
dc.subject | iron | en |
dc.subject | Molecular structure | en |
dc.subject | Chemical bonds | en |
dc.subject | Protons | en |
dc.subject | Spectroscopy, Fourier Transform Infrared | en |
dc.subject | Raman spectrometry | en |
dc.subject | heme | en |
dc.subject | Spectrum Analysis, Raman | en |
dc.subject | histidine | en |
dc.subject | Cytochrome b Group | en |
dc.subject | Electron Transport Complex IV | en |
dc.subject | Thermus thermophilus | en |
dc.subject | cytochrome b | en |
dc.subject | cytochrome ba3 | en |
dc.subject | cytochrome c oxidase | en |
dc.subject | oxidoreductase | en |
dc.subject | nitrous oxide | en |
dc.subject | Enzymatic formation | en |
dc.subject | Ferrous Compounds | en |
dc.subject | ferrous ion | en |
dc.subject | Heme-copper centers | en |
dc.subject | nitrate reductase | en |
dc.subject | nitrogen oxide | en |
dc.subject | Nitrogen Oxides | en |
dc.subject | Oxidases | en |
dc.title | Detection of the His-heme Fe2+-NO species in the reduction of NO to N2O by ba3-oxidase from thermus thermophilus | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1021/ja0539490 | |
dc.description.volume | 127 | |
dc.description.issue | 43 | |
dc.description.startingpage | 15161 | |
dc.description.endingpage | 15167 | |
dc.author.faculty | 002 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences | |
dc.author.department | Τμήμα Χημείας / Department of Chemistry | |
dc.type.uhtype | Article | en |
dc.description.notes | <p>Cited By :49</p> | en |
dc.source.abbreviation | J.Am.Chem.Soc. | en |
dc.contributor.orcid | Pinakoulaki, Eftychia [0000-0003-3320-6112] | |
dc.contributor.orcid | Varotsis, Constantinos [0000-0003-2771-8891] | |
dc.gnosis.orcid | 0000-0003-3320-6112 | |
dc.gnosis.orcid | 0000-0003-2771-8891 | |